Open observatory of CO₂ and flight inefficiency in Europe, from ADS-B trajectories. Measures the distance from a theoretical optimum — not recoverable fuel. Open method, open code, aggregate data only. Personal project, built with AI assistance.https://bsky.app/profile/co2gap.orghttps://bsky.app/profile/co2gap.org/post/3muhutzsepk2jHow far do European flights sit from a theoretical optimum? co2gap measures it from the ADS-B trajectories of 1,833,127 flights over 197 days: 23.4 Mt emitted in flight, 2.50 Mt of gap — a distance from that optimum, not recoverable fuel. 152 airports and 5,483 routes. co2gap.org https://co2gap.org01 Sep 2026 16:49 +0000at://did:plc:2vfcfwmukn4oncl4cdiabnc2/app.bsky.feed.post/3muhutzsepk2j